Lucius Valerius Datus was a Roman eques who flourished during the reign of the emperor Septimius Severus and his sons.
He held a series of imperial offices, most notably praefectus or governor of Roman Egypt from 216 to 217.
[1] Appointed to his prefecture in Egypt by Caracalla, Datus was slow in recognizing that emperor's replacement by Macrinus.
[2] A surviving papyrus document shows Datus was still in office 18 July 217.
[3] According to Cassius Dio Macrinus had Valerius Datus executed, doubtlessly for this delay.